The first was why does Google's fetch and render feature in Google Search Console show the page rendered properly but the Google cache version shows nothing at all?

Google's John Mueller said this is normal. He said "At the moment, that's normal: the cached page shows the HTML page as it was fetched, not the rendered view."

So do not worry if you see this for your AngularJS site in Google.

The second question in the hangout was is it okay to generate canonicals and the like through JavaScript in the body area, not the header, will Google pick up on it with AngularJS frameworks. John Mueller said it should work fine that way as Google should render it.